Electronic expansion valve control method, device and controller

Abstract

The present application relates to an electronic expansion valve control method, device and controller. The method includes: obtaining the ambient temperature and vehicle speed information of a target vehicle at the current refrigeration moment, and obtaining the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the starting refrigeration moment of the battery of the target vehicle to the current refrigeration moment; according to the ambient temperature and vehicle speed information, obtaining the basic opening degree and composite opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment, and according to the vehicle speed information, obtaining the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment; according to the basic opening degree, composite opening degree, opening degree adjustment rate and battery refrigeration duration, obtaining the target opening degree of the electronic expansion valve at the current refrigeration moment; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening degree. Using this method can reduce the opening degree adjustment delay of the electronic expansion valve.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and particularly to a method, device and controller for controlling an electronic expansion valve. Background Art

[0002] With the development of new energy vehicle technology, a technology using liquid cooling to maintain the battery temperature has emerged. By controlling the opening degree of the electronic expansion valve, i.e., EXV, the refrigerant flow rate into the battery cooler can be controlled, so as to precisely control the battery temperature. In related technologies, the method for controlling the opening degree of the electronic expansion valve is usually based on the superheat degree, i.e., the difference between the actual battery temperature and the ideal temperature, and combines the PI algorithm to realize the opening degree adjustment of the electronic expansion valve.

[0003] However, at the beginning of cooling, when the components in the system have not reached a stable working state, since the heat generated by the battery needs to be conducted to the refrigeration medium through the cold plate, and the refrigeration medium then dissipates this heat to the external environment. This series of heat transfer processes involves multiple links, and each link has a certain thermal resistance and heat capacity, so that it takes a certain amount of time for the heat to be generated and finally dissipated. Therefore, at the start-up stage of the cooling system, the superheat degree usually exceeds the set target range and requires a long time to adjust to make the superheat degree gradually tend to be stable. In addition, due to the large thermal inertia between parts of the system, there is also a lag phenomenon in the opening degree adjustment of the electronic expansion valve, which means that even if the controller makes an adjustment according to the current temperature feedback, there will be an obvious delay in the actual temperature change. It can be seen that the current method for realizing the opening degree adjustment of the electronic expansion valve based on the superheat degree combined with the PI algorithm has a delay. Summary of the Invention

[0004] Based on this, it is necessary to provide an electronic expansion valve control method, device, controller, computer-readable storage medium and computer program product that can reduce the delay in the opening degree adjustment of the electronic expansion valve for the above technical problems.

[0005] In a first aspect, the present application provides an electronic expansion valve control method, including:

[0006] Obtain the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and obtain the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the start refrigeration moment of the battery of the target vehicle to the current refrigeration moment;

[0007] According to the ambient temperature and the vehicle speed information, obtain the basic opening degree and composite opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment, and according to the vehicle speed information, obtain the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment;

[0008] Obtain the target opening of the electronic expansion valve at the current refrigeration moment according to the basic opening, compound opening, opening adjustment rate, and the battery refrigeration duration; the target opening is used to control the opening of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening.

[0009] In one embodiment, the obtaining the opening adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information includes: obtaining the basic opening adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information; obtaining a first correction coefficient and a second correction coefficient for correcting the basic opening adjustment rate in the current refrigeration moment; using the first correction coefficient and the second correction coefficient to correct the basic opening adjustment rate to obtain the opening adjustment rate.

[0010] In one embodiment, the first correction coefficient is obtained through the following steps: obtaining the refrigeration control cycle where the current refrigeration moment is located, and obtaining the current current fluctuation information and current vehicle speed fluctuation information of the refrigeration control cycle; the current current fluctuation information is used to characterize the fluctuation of the battery current of the target vehicle in the refrigeration control cycle, and the current vehicle speed fluctuation information is used to characterize the fluctuation of the vehicle speed of the target vehicle in the refrigeration control cycle; obtaining a pre-constructed first calibration relationship; different current fluctuation information and vehicle speed fluctuation information and their corresponding relationships with different first correction coefficients are stored in the first calibration relationship; wherein, the first correction coefficient has a negative correlation with the current fluctuation information and the vehicle speed fluctuation information; using the correction coefficient corresponding to the current current fluctuation information and the current vehicle speed fluctuation information in the first calibration relationship as the first correction coefficient for correcting the basic opening adjustment rate in the current refrigeration moment.

[0011] In one embodiment, the second correction coefficient is obtained through the following steps: obtaining the current battery current value of the target vehicle at the current refrigeration moment, and a pre-constructed second calibration relationship; different battery current values and their corresponding relationships with different current calibration parameters are stored in the second calibration relationship; wherein, the current calibration parameter has a positive correlation with the battery current value; obtaining the current current calibration parameter corresponding to the current battery current value from the second calibration relationship; according to the current battery current value and the current current calibration parameter, obtaining the second correction coefficient for correcting the basic opening adjustment rate in the current refrigeration moment.

[0012] In one embodiment, before obtaining the current current calibration parameter corresponding to the current battery current value from the second calibration relationship, the method further includes: in a case where the current battery current value does not reach the minimum battery current value stored in the second calibration relationship, updating the current battery current value to the minimum battery current value.

[0013] In one embodiment, obtaining the basic opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information includes: obtaining a pre-constructed third calibration relationship; different vehicle speed intervals and different basic opening degree adjustment rates are stored in the third calibration relationship; wherein, the basic opening degree adjustment rate has a positive correlation with the vehicle speed interval; obtaining the target vehicle speed interval where the vehicle speed information is located, and using the basic opening degree adjustment rate corresponding to the target vehicle speed interval in the third calibration relationship as the basic opening degree adjustment rate at the current refrigeration moment.

[0014] In one embodiment, obtaining the basic opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment according to the ambient temperature and the vehicle speed information includes: obtaining a pre-constructed fourth calibration relationship; different ambient temperatures and vehicle speed information, and the corresponding relationship with different basic opening degrees are stored in the fourth calibration relationship; using the basic opening degree corresponding to the ambient temperature and the vehicle speed information at the current refrigeration moment in the fourth calibration relationship as the basic opening degree of the electronic expansion valve at the current refrigeration moment.

[0015] In one embodiment, the composite opening degree is obtained through the following steps: obtaining a pre-constructed fifth calibration relationship; different ambient temperatures and vehicle speed information, and the corresponding relationship with different composite opening degrees are stored in the fifth calibration relationship; using the composite opening degree corresponding to the ambient temperature and the vehicle speed information at the current refrigeration moment in the fifth calibration relationship as the composite opening degree of the electronic expansion valve at the current refrigeration moment.

[0016] In one embodiment, obtaining the target opening degree of the electronic expansion valve at the current refrigeration moment according to the basic opening degree, the composite opening degree, the opening degree adjustment rate, and the battery refrigeration duration includes: obtaining the refrigeration working mode of the target vehicle at the current refrigeration moment, and obtaining the temperature difference information of the evaporator of the target vehicle at the current refrigeration moment; the temperature difference information represents the difference between the actual temperature and the target temperature of the evaporator at the current refrigeration moment; the evaporator is used to adjust the temperature of the occupant compartment of the target vehicle; according to the refrigeration working mode, obtaining the occupant compartment comfort compensation coefficient preset for the occupant compartment, and using the occupant compartment comfort compensation coefficient and the temperature difference information to obtain the opening degree loss of the electronic expansion valve at the current refrigeration moment; obtaining the target opening degree according to the basic opening degree, the composite opening degree, the opening degree adjustment rate, the battery refrigeration duration, and the opening degree loss.

[0017] In one embodiment, the refrigeration working mode includes: a first working mode for indicating that the occupant compartment is preferentially refrigerated, a second working mode for preferentially refrigerating the battery of the target vehicle, and a third working mode for only refrigerating the battery; obtaining the occupant compartment comfort compensation coefficient preset for the occupant compartment according to the refrigeration working mode includes: when the refrigeration working mode is the first working mode, setting the occupant compartment comfort compensation coefficient as the first compensation coefficient; when the refrigeration working mode is the second working mode, setting the occupant compartment comfort compensation coefficient as the second compensation coefficient; wherein, the second compensation coefficient is less than the first compensation coefficient; when the refrigeration working mode is the third working mode, setting the occupant compartment comfort compensation coefficient to zero.

[0018] In one embodiment, obtaining the refrigeration working mode of the target vehicle at the current refrigeration moment includes: when there is a refrigeration demand in the occupant compartment and the battery cell temperature exceeds the first temperature threshold but does not exceed the second temperature threshold, determining that the refrigeration working mode is the first working mode; the second temperature threshold is greater than the first temperature threshold; when there is a refrigeration demand in the occupant compartment and the battery cell temperature exceeds the second temperature threshold but does not exceed the third temperature threshold, determining that the refrigeration working mode is the second working mode; the third temperature threshold is greater than the second temperature threshold; when the battery cell temperature exceeds the third temperature threshold, or when there is no refrigeration demand in the occupant compartment and the battery cell temperature exceeds the first temperature threshold, determining that the refrigeration working mode is the third working mode.

[0019] In a second aspect, the present application further provides an electronic expansion valve control device, including:

[0020] A vehicle information acquisition module, configured to acquire the ambient temperature and vehicle speed information of a target vehicle at a current refrigeration moment, and acquire the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the starting refrigeration moment of the battery of the target vehicle to the current refrigeration moment;

[0021] An adjustment information acquisition module, configured to acquire a basic opening degree and a composite opening degree of an electronic expansion valve of the target vehicle at the current refrigeration moment according to the ambient temperature and the vehicle speed information, and acquire an opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information;

[0022] A target opening degree acquisition module, configured to acquire a target opening degree of the electronic expansion valve at the current refrigeration moment according to the basic opening degree, the composite opening degree, the opening degree adjustment rate, and the battery refrigeration duration; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening degree.

[0023] In a third aspect, the present application further provides a controller, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the method according to any one of the embodiments of the first aspect are implemented.

[0024] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method according to any one of the embodiments of the first aspect are implemented.

[0025] In a fifth aspect, the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of the method according to any one of the embodiments of the first aspect are implemented.

[0026] The above electronic expansion valve control method, device, controller, storage medium and computer program product obtain the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and obtain the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the starting refrigeration moment of the battery of the target vehicle to the current refrigeration moment; according to the ambient temperature and vehicle speed information, obtain the basic opening degree and composite opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment, and according to the vehicle speed information, obtain the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment; according to the basic opening degree, composite opening degree, opening degree adjustment rate and battery refrigeration duration, obtain the target opening degree of the electronic expansion valve at the current refrigeration moment; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening degree. In this application, after the target vehicle enters the battery refrigeration mode, the opening degree of the electronic expansion valve of the target vehicle can be controlled. The control method is to collect the ambient temperature, vehicle speed and battery refrigeration duration of the target vehicle at the current moment, so as to obtain the basic opening degree and composite opening degree of the electronic expansion valve at the current moment through the ambient temperature and vehicle speed, and obtain the opening degree adjustment rate of the electronic expansion valve at the current moment through the vehicle speed. Thus, the basic opening degree, composite opening degree, opening degree adjustment rate and battery refrigeration duration at the current moment can be used to obtain the target opening degree for the control of the electronic expansion valve. This control method does not need to use the PI algorithm based on superheat to realize the opening degree adjustment of the electronic expansion valve, so the opening degree adjustment delay of the electronic expansion valve can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic flow chart of the electronic expansion valve control method in an embodiment;

[0029] Figure 2 It is a schematic flow chart of obtaining the opening degree adjustment rate at the current refrigeration moment in an embodiment;

[0030] Figure 3 It is a schematic flow chart of obtaining the first correction coefficient in an embodiment;

[0031] Figure 4 It is a schematic flow chart of obtaining the second correction coefficient in an embodiment;

[0032] Figure 5 It is a schematic flow chart of obtaining the target opening degree at the current refrigeration moment in an embodiment;

[0033] Figure 6 Schematic diagram of the relationship between cooling time and the opening adjustment of the electronic expansion valve in an embodiment;

[0034] Figure 7 Schematic diagram of the execution logic of the single - double refrigeration priority in the passenger compartment in an embodiment;

[0035] Figure 8 Structural block diagram of the electronic expansion valve control device in an embodiment;

[0036] Figure 9 Internal structure diagram of the controller in an embodiment. Specific implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] In an embodiment, as Figure 1 shown, a method for controlling an electronic expansion valve is provided. In this embodiment, an example is given where this method is applied to a controller in a vehicle for controlling the electronic expansion valve. In this embodiment, the method includes the following steps:

[0039] Step S101, obtain the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and obtain the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the start refrigeration moment of the target vehicle's battery to the current refrigeration moment.

[0040] Among them, the target vehicle refers to a vehicle that needs to control the electronic expansion valve to cool the vehicle battery and the passenger compartment. The electronic expansion valve can be connected to the refrigeration system. By controlling the flow rate of the refrigerant between the condenser and the evaporator, that is, the electronic expansion valve can control the flow rate of the refrigerant flowing into the evaporator by controlling the opening degree, so as to absorb the heat in the surrounding environment (such as the passenger compartment or the battery) and achieve the refrigeration effect. The electronic expansion valve can be composed of a valve body, an electric control mechanism, a sensor interface and a control unit. The valve body is used to accommodate and guide the flow of the refrigerant. The electric control mechanism can control the opening and closing of the valve through a motor or other driving methods to adjust the refrigerant flow rate. The sensor interface can be connected to temperature and pressure sensors. These sensors monitor the system state in real time and provide feedback information to the control unit. The control unit can calculate and adjust the opening degree of the valve based on the sensor data to achieve precise control.

[0041] The current refrigeration time refers to the current time after the battery refrigeration mode is turned on, and the starting refrigeration time refers to the turning-on time of the battery refrigeration mode. The battery refrigeration duration is the duration of the battery refrigeration mode being turned on, which can be used to represent the duration between the starting time of the battery refrigeration mode and the current time, that is, the duration from the starting refrigeration time to the current refrigeration time.

[0042] Specifically, after the target vehicle starts the battery refrigeration mode, the controller can obtain the temperature of the driving environment where the target vehicle is located at the current refrigeration time in real time, that is, the ambient temperature, and the driving speed of the target vehicle, that is, the vehicle speed information. At the same time, the controller can also obtain the battery refrigeration duration when the target vehicle enters the battery refrigeration mode in real time.

[0043] Step S102: Obtain the basic opening degree and the composite opening degree of the electronic expansion valve of the target vehicle at the current refrigeration time according to the ambient temperature and the vehicle speed information, and obtain the opening degree adjustment rate of the electronic expansion valve at the current refrigeration time according to the vehicle speed information.

[0044] The basic opening degree refers to the basic opening degree information of the electronic expansion valve of the target vehicle. This opening degree is only used to meet the most basic cooling requirements of the battery. However, when the vehicle is driving fast or the external ambient temperature is high, the heat generation of the battery is large at this time, and the basic opening degree cannot meet the battery cooling requirements. Therefore, a composite opening degree used to compensate for the basic opening degree needs to be introduced to ensure that the battery cooling requirements are met. The opening degree adjustment rate is used to represent the adjustment rate of the opening degree of the electronic expansion valve. Since the charge and discharge current of the battery is related to the heat generation rate of the battery, and the vehicle speed is a key factor affecting the battery power consumption, that is, the vehicle speed can reflect the magnitude of the battery current. Therefore, in order to ensure that the opening degree adjustment rate of the electronic expansion valve can match the battery heat generation rate, the opening degree adjustment rate can be determined by the vehicle speed.

[0045] Specifically, after the controller obtains the ambient temperature and the vehicle speed information, it can obtain the basic opening degree and the composite opening degree at the current refrigeration time according to the ambient temperature and the vehicle speed information. For example, the basic opening degree and the composite opening degree can be calculated through the ambient temperature and the vehicle speed information, or the basic opening degree and the composite opening degree can be obtained by looking up a table. At the same time, the controller can also obtain the opening degree adjustment rate of the electronic expansion valve at the current refrigeration time according to the vehicle speed information. Similar to the acquisition methods of the basic opening degree and the composite opening degree, the acquisition of the opening degree adjustment rate can be obtained by calculation or by various methods such as looking up a table.

[0046] Step S103: Obtain the target opening degree of the electronic expansion valve at the current refrigeration time according to the basic opening degree, the composite opening degree, the opening degree adjustment rate, and the battery refrigeration duration; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration time to be adjusted to the target opening degree.

[0047] The target opening degree is the opening degree adjustment target of the electronic expansion valve of the target vehicle at the current refrigeration moment. This target opening degree can be calculated based on the basic opening degree, composite opening degree, opening degree adjustment rate, and battery refrigeration duration. Specifically, after the controller obtains the basic opening degree, composite opening degree, opening degree adjustment rate, and battery refrigeration duration, it can calculate the target opening degree of the electronic expansion valve at the current refrigeration moment based on the above information. Then, it can send the target opening degree to the adjustment mechanism for adjusting the opening degree of the electronic expansion valve, so that the adjustment mechanism adjusts the opening degree of the electronic expansion valve at the current refrigeration moment to the target opening degree, realizing the precise control of the electronic expansion valve to achieve the purpose of accurately controlling the battery temperature. Among them, the calculation of the target opening degree can be obtained according to the pre-established correspondence relationship between the target opening degree, basic opening degree, composite opening degree, opening degree adjustment rate, and battery refrigeration duration. This correspondence relationship can be characterized by a function, and this function can be obtained by collecting the target opening degrees associated with different basic opening degrees, composite opening degrees, opening degree adjustment rates, and battery refrigeration durations, and then performing curve fitting using the above associations.

[0048] For example, the correspondence relationship of the target opening degree at the current refrigeration moment can be calculated by the following formula:

[0049]

[0050] Among them, represents the target opening degree of the electronic expansion valve at the current refrigeration moment, represents the basic opening degree of the electronic expansion valve at the current refrigeration moment, represents the composite opening degree of the electronic expansion valve at the current refrigeration moment, represents the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment, and represents the battery refrigeration duration.

[0051] In the above electronic expansion valve control method, the target opening of the electronic expansion valve at the current refrigeration moment is obtained according to the basic opening, the composite opening, the opening adjustment rate, and the battery refrigeration duration; the target opening is used to control the opening of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening. In this application, after the target vehicle enters the battery refrigeration mode, the opening of the electronic expansion valve of the target vehicle can be controlled. The control method is to collect the ambient temperature, vehicle speed, and battery refrigeration duration of the target vehicle at the current moment, so as to obtain the basic opening and composite opening of the electronic expansion valve at the current moment through the ambient temperature and vehicle speed, and obtain the opening adjustment rate of the electronic expansion valve at the current moment through the vehicle speed. Thus, the target opening can be obtained by using the basic opening, composite opening, opening adjustment rate, and battery refrigeration duration at the current moment to control the electronic expansion valve. This control method does not need to use the superheat degree combined with the PI algorithm to realize the opening adjustment of the electronic expansion valve, so the opening adjustment delay of the electronic expansion valve can be reduced.

[0052] In one embodiment, as Figure 2 shown, step S102 may further include:

[0053] Step S201, according to the vehicle speed information, obtain the basic opening adjustment rate of the electronic expansion valve at the current refrigeration moment.

[0054] Among them, the basic opening adjustment rate refers to the reference opening adjustment rate, and this adjustment rate is directly related to the vehicle speed. Specifically, after the controller obtains the vehicle speed information at the current refrigeration moment, the vehicle speed information can be used to obtain the basic opening adjustment rate at the current refrigeration moment. For example, the basic opening adjustment rate can be obtained by using the vehicle speed information through formula calculation, or the basic opening adjustment rate can be obtained by looking up a table.

[0055] Step S202, obtain the first correction coefficient and the second correction coefficient for correcting the basic opening adjustment rate in the current refrigeration moment;

[0056] Step S203, use the first correction coefficient and the second correction coefficient to correct the basic opening adjustment rate to obtain the opening adjustment rate.

[0057] The first correction coefficient and the second correction coefficient refer to two different correction coefficients used to correct the basic opening adjustment rate. The controller can also obtain the first correction coefficient and the second correction coefficient, so as to use the first correction coefficient and the second correction coefficient to correct the basic opening adjustment rate to obtain the final opening adjustment rate at the current refrigeration moment. The first correction coefficient and the second correction coefficient can be determined according to some real-time information of the target vehicle at the current refrigeration moment. Among them, the calculation of the opening adjustment rate can be obtained according to the corresponding relationship between the pre-constructed basic opening adjustment rate, the first correction coefficient and the second correction coefficient. This corresponding relationship can also be characterized by a function. The function can be obtained by pre-collecting the opening adjustment rates associated with different basic opening adjustment rates, the first correction coefficient and the second correction coefficient, and then performing curve fitting using the above associations.

[0058] For example, the corresponding relationship of the opening adjustment rate of the electronic expansion valve at the current refrigeration moment can be calculated by the following formula:

[0059]

[0060] Among them, represents the opening adjustment rate of the electronic expansion valve at the current refrigeration moment, represents the basic opening adjustment rate of the electronic expansion valve at the current refrigeration moment, represents the first correction coefficient, then represents the second correction coefficient.

[0061] In this embodiment, after obtaining the basic opening adjustment rate through the vehicle speed information, the basic opening adjustment rate can be further corrected by using the first correction coefficient and the second correction coefficient. In this way, the acquisition accuracy of the basic opening adjustment rate can be further improved.

[0062] Furthermore, as Figure 3 shown, step S202 can further include:

[0063] Step S301, obtaining the refrigeration control cycle where the current refrigeration moment is located, and obtaining the current current fluctuation information and the current vehicle speed fluctuation information of the refrigeration control cycle; the current current fluctuation information is used to characterize the fluctuation of the battery current of the target vehicle in the refrigeration control cycle, and the current vehicle speed fluctuation information is used to characterize the fluctuation of the vehicle speed of the target vehicle in the refrigeration control cycle.

[0064] The refrigeration control cycle refers to the control cycle in which the current refrigeration moment is located. After the target vehicle enters the battery refrigeration mode, the refrigeration control cycle can be divided according to a preset time interval. For example, if the time interval is set to 3 s, then if the current refrigeration moment is the 5th second after entering the refrigeration mode, the refrigeration control cycle in which the current refrigeration moment is located is the second refrigeration control cycle. The current current fluctuation information can be used to characterize the fluctuation of the battery current of the target vehicle in the refrigeration control cycle, and can be characterized by the difference between the maximum value and the minimum value of the current in this refrigeration control cycle, while the current vehicle speed fluctuation information is used to characterize the fluctuation of the vehicle speed of the target vehicle in the refrigeration control cycle, and can be characterized by the difference between the maximum value and the minimum value of the vehicle speed in this refrigeration control cycle.

[0065] Specifically, the controller can identify the refrigeration control cycle in which the current refrigeration moment is located, and further obtain the current fluctuation information and vehicle speed fluctuation information of this refrigeration control cycle as the current current fluctuation information and the current vehicle speed fluctuation information.

[0066] For example, the current current fluctuation information can be calculated by the following formula:

[0067]

[0068] Where and are the maximum value and the minimum value of the current in the refrigeration control cycle in which the current refrigeration moment is located, represents the current current fluctuation information.

[0069] The current vehicle speed fluctuation information can be calculated by the following formula:

[0070]

[0071] Where and are the maximum value and the minimum value of the vehicle speed in the refrigeration control cycle in which the current refrigeration moment is located, represents the current vehicle speed fluctuation information.

[0072] Step S302, obtain the pre-constructed first calibration relationship; different current fluctuation information, vehicle speed fluctuation information and corresponding relationships of different first correction coefficients are stored in the first calibration relationship; among them, the first correction coefficient has a negative correlation with the current fluctuation information and the vehicle speed fluctuation information.

[0073] The first calibration relationship refers to the corresponding relationship for storing different current fluctuation information and vehicle speed fluctuation information and different first correction coefficients. This calibration relationship can be a certain corresponding relationship table, and the data in the table can be pre-calibrated. Moreover, the first correction coefficient has a negative correlation with the current fluctuation information and the vehicle speed fluctuation information, that is, the greater the current fluctuation information, the smaller the first correction coefficient, and at the same time, the greater the vehicle speed fluctuation information, the smaller the first correction coefficient.

[0074] Among them, the first calibration relationship can be calibrated in the following way: First, make the vehicle drive at a constant speed on the actual road and enter the battery cooling mode. By setting the basic opening and the composite opening, and keeping the vehicle speed fluctuations within 3 minutes at 10, 20... 80 respectively, observe the battery temperature performance and current fluctuations at this time, and correct the first correction coefficient. If the battery temperature remains stable or shows a downward trend within a certain period of time (10 - 20 minutes), record the first correction coefficient at this time. For example, the first calibration relationship can be as shown in Table 1:

[0075] Table 1 First Calibration Relationship Table

[0076]

[0077] Step S303, use the correction coefficient corresponding to the current current fluctuation information and the current vehicle speed fluctuation information in the first calibration relationship as the first correction coefficient for correcting the basic opening adjustment rate during the current cooling moment.

[0078] After obtaining the first calibration relationship, the correction coefficient recorded in the first calibration relationship corresponding to the current current fluctuation information and the current vehicle speed fluctuation information can be used as the first correction coefficient for correcting the basic opening adjustment rate during the current cooling moment. For example, when the current current fluctuation information is 10 A and the current vehicle speed fluctuation information is 10 km / h, the corresponding first correction coefficient is 0.6. Then the first correction coefficient for correcting the basic opening adjustment rate during the current cooling moment is 0.6.

[0079] In this embodiment, the first correction coefficient for correcting the basic opening adjustment rate can also be obtained through the current current fluctuation information and the vehicle speed fluctuation information of the cooling control cycle where the current cooling moment is located, and by combining the pre-constructed first calibration relationship. This way can improve the accuracy and efficiency of obtaining the first correction coefficient.

[0080] In addition, as Figure 4 shown, step S202 can further include:

[0081] Step S401: Obtain the current battery current value of the target vehicle at the current refrigeration moment, as well as a pre-constructed second calibration relationship. Different battery current values and their corresponding current calibration parameters are stored in the second calibration relationship, and the current calibration parameter is positively correlated with the battery current value.

[0082] The current calibration parameter is the calibration parameter used to convert the battery current value into a second correction coefficient. In this embodiment, the second correction coefficient can be a correction parameter for correcting the current. When the vehicle is traveling at high speed, the motor load increases, and a greater power output is required. At this time, the overall current level is relatively high, and the change of the current is slow and relatively stable. Therefore, a second correction coefficient needs to be introduced for correction. The current battery current value refers to the current magnitude of the battery of the target vehicle at the current refrigeration moment.

[0083] The second calibration relationship refers to the correspondence between different battery current values and different current calibration parameters. This calibration relationship can be a corresponding relationship table, and the data in the table can be pre-calibrated. Moreover, the current calibration parameter is positively correlated with the battery current value, that is, the greater the battery current, the greater the current calibration parameter. The second calibration relationship can be determined according to the following principles: 1. If the battery cooling rate does not meet the standard, appropriately increase the magnitude of each second correction coefficient; 2. Appropriately control the product of the second calibration coefficient and the battery current value to ensure that the product cannot be too large, that is, the product ≤ 20; 3. The product of the second calibration coefficient and the battery current value can increase correspondingly with the increase of the battery current value.

[0084] For example, the second calibration relationship can be as shown in Table 2:

[0085] Table 2 Second Calibration Relationship Table

[0086]

[0087] Specifically, the controller can also obtain the battery current value of the target vehicle at the current refrigeration moment, as well as the second calibration relationship stored in the controller in advance, which is used to represent the correspondence between different battery current values and different current calibration parameters.

[0088] Step S402: Obtain the current current calibration parameter corresponding to the current battery current value from the second calibration relationship.

[0089] The current current calibration parameter refers to the current calibration parameter corresponding to the current battery current value recorded in the second calibration relationship. For example, as shown in Table 2, if the current battery current value is 50A, then the current calibration parameter is 0.02. The controller can obtain the current calibration parameter corresponding to the current battery current value from the second calibration relationship as the current current calibration parameter.

[0090] Step S403: Obtain a second correction coefficient for correcting the basic opening adjustment rate during the current refrigeration moment according to the current battery current value and the current current calibration parameter.

[0091] After obtaining the current battery current value and the current current calibration parameter, the current battery current value and the current current calibration parameter can be used to calculate a second correction coefficient for correcting the basic opening adjustment rate during the current refrigeration moment. For example, the second correction coefficient can be calculated by the following formula:

[0092]

[0093] where is the absolute value of the current battery current, that is, the current battery current value, is the current current calibration parameter.

[0094] In this embodiment, the second correction coefficient can be calculated through the current battery current value and the current current calibration parameter, and the current current calibration parameter can be obtained through a pre-constructed second calibration relationship. In this way, the accuracy and efficiency of obtaining the second correction coefficient can be improved.

[0095] Moreover, before step S402, it may further include: when the current battery current value does not reach the minimum battery current value stored in the second calibration relationship, updating the current battery current value to the minimum battery current value.

[0096] The minimum battery current value refers to the minimum value among the multiple different battery current values stored in the second calibration relationship. Taking Table 2 as an example, the minimum battery current value is 50A. To avoid the situation that the calculated second correction coefficient is too small when the current of the vehicle is small in the stationary state, if the current battery current value does not reach the minimum battery current value, that is, does not reach 50A, then the current battery current value is updated to the above minimum battery current value, and the updated current battery current value is used to calculate the second correction coefficient. For example, if the current battery current value is 20A, which is less than the minimum battery current value of 50A, in this case, the minimum battery current value, that is, 50A, is used for calculation by default.

[0097] In this embodiment, if the current battery current value does not reach the minimum battery current value stored in the second calibration relationship, the current battery current value is updated to the minimum battery current value, and thus the second correction coefficient is calculated through the minimum battery current value. In this way, the situation that the calculated second correction coefficient is too small can be avoided, and the accuracy of obtaining the second correction coefficient can be further improved.

[0098] In one embodiment, step S201 may further include: obtaining a pre-constructed third calibration relationship; the third calibration relationship stores the corresponding relationship between different vehicle speed ranges and different basic opening adjustment rates; wherein, the basic opening adjustment rate is positively correlated with the vehicle speed range; obtaining the target vehicle speed range where the vehicle speed information is located, and using the basic opening adjustment rate corresponding to the target vehicle speed range in the third calibration relationship as the basic opening adjustment rate at the current refrigeration moment.

[0099] The third calibration relationship refers to the corresponding relationship used to store different vehicle speed ranges and different basic opening adjustment rates. This calibration relationship can also be a certain corresponding relationship table, and the data in the table can be pre-calibrated. Moreover, the basic opening adjustment rate is positively correlated with the vehicle speed range, that is, the greater the vehicle speed corresponding to the vehicle speed range, the greater the basic opening adjustment rate. This calibration relationship can be determined in the following way. The selection of the basic opening adjustment rate should first be based on the target vehicle model and battery model. If the target vehicle is relatively large as a whole and the maximum heat generation of the battery pack is relatively high, a larger basic opening adjustment rate is used. In addition, the adjustment rate also needs to be re-calibrated and confirmed by the calibration personnel based on the overall temperature performance and cooling effect of the battery during the actual vehicle driving process (low speed, medium speed, high speed).

[0100] For example, the third calibration relationship can be as shown in Table 3:

[0101] Table 3 Third Calibration Relationship Table

[0102]

[0103] Specifically, after the controller obtains the vehicle speed information of the target vehicle at the current refrigeration moment, it can first obtain the pre-constructed third calibration relationship, and obtain the vehicle speed range where the vehicle speed information is located as the target vehicle speed range from the multiple vehicle speed ranges included in the third calibration relationship. For example, if the vehicle speed is 50 km / h, then the target vehicle speed range is the range of 40 < V < 80, and the corresponding basic opening adjustment rate of 5 in this range is used as the basic opening adjustment rate at the current refrigeration moment.

[0104] In this embodiment, the target vehicle speed range where the vehicle speed information is located can also be identified by pre-constructing the third calibration relationship, so as to use the basic opening adjustment rate corresponding to the target vehicle speed range as the basic opening adjustment rate at the current refrigeration moment. By this method, the acquisition efficiency of the basic opening adjustment rate at the current refrigeration moment can be improved.

[0105] In one embodiment, step S102 may further include: obtaining a pre-constructed fourth calibration relationship; the fourth calibration relationship stores the corresponding relationship between different ambient temperatures, vehicle speed information, and different basic opening degrees; using the basic opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fourth calibration relationship as the basic opening degree of the electronic expansion valve at the current refrigeration moment.

[0106] The fourth calibration relationship is used to store the corresponding relationship between different ambient temperatures, vehicle speed information, and different basic opening degrees, and this calibration relationship can be stored in tabular form. Moreover, this calibration relationship can be obtained by making the vehicle travel at a constant speed in an environmental chamber, ensuring that the heat generation power of the battery is relatively stable, then turning on the battery cooling for 10 minutes, and recording the opening degree of the current electronic expansion valve when the average temperature of the battery cells remains stable without an upward or downward trend. In this embodiment, the basic opening degree can be obtained by querying the calibration relationship table, that is, using the basic opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment stored in the fourth calibration relationship as the basic opening degree of the electronic expansion valve at the current refrigeration moment.

[0107] For example, the fourth calibration relationship can be as shown in Table 4:

[0108] Table 4 Fourth Calibration Relationship Table

[0109]

[0110] It can be seen that if the ambient temperature at the current refrigeration moment is 10°C and the vehicle speed is 30 km / h, the basic opening degree is 20, and if the ambient temperature at the current refrigeration moment is 10°C and the vehicle speed is 40 km / h, the basic opening degree is 30, and so on.

[0111] In this embodiment, the current basic opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment can also be obtained by pre-setting the fourth calibration relationship, and in this way, the efficiency of obtaining the basic opening degree can be improved.

[0112] In one embodiment, step S102 may also include: obtaining a pre-constructed fifth calibration relationship; the fifth calibration relationship stores the corresponding relationship between different ambient temperatures, vehicle speed information, and different composite opening degrees; using the composite opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fifth calibration relationship as the composite opening degree of the electronic expansion valve at the current refrigeration moment.

[0113] The fifth calibration relationship is used to store the corresponding relationship between different ambient temperatures, vehicle speeds, and different composite opening degrees. Similar to the fourth calibration relationship, this calibration relationship can be stored in tabular form. Moreover, the calibration of this calibration relationship can be carried out in an environmental chamber. Given a constant vehicle speed and temperature, after the battery heats up to a certain temperature, then turn on the battery cooling. At this time, if the total opening degree of the composite opening degree and the basic opening degree can make the cooling time of the battery from entry to exit about 30 minutes (this time needs to be determined through experiments on the battery cold plate), record this composite opening degree. In this embodiment, the composite opening degree can be obtained by querying the calibration relationship table, that is, the composite opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment stored in the fifth calibration relationship is used as the composite opening degree of the electronic expansion valve at the current refrigeration moment.

[0114] For example, the fifth calibration relationship can be as shown in Table 5:

[0115] Table 5 Fifth Calibration Relationship Table

[0116]

[0117] It can be seen that if the ambient temperature at the current refrigeration moment is 10°C and the vehicle speed is 30 km / h, the composite opening degree is 40. And if the ambient temperature at the current refrigeration moment is 10°C and the vehicle speed is 40 km / h, the composite opening degree is 30, and so on.

[0118] In this embodiment, the fifth calibration relationship can also be preset, so as to obtain the composite opening degree at the current refrigeration moment corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment. By this method, the efficiency of obtaining the composite opening degree can be improved.

[0119] In one embodiment, as Figure 5 shown, step S103 may further include:

[0120] Step S501, obtain the refrigeration working mode of the target vehicle at the current refrigeration moment, and obtain the temperature difference information of the evaporator of the target vehicle at the current refrigeration moment; the temperature difference information represents the difference between the actual temperature and the target temperature of the evaporator at the current refrigeration moment; the evaporator is used to adjust the temperature of the occupant compartment of the target vehicle.

[0121] The evaporator refers to a component in the air-conditioning system of the target vehicle. Its main function is to achieve refrigeration through heat exchange to regulate the temperature of the passenger compartment of the target vehicle. The temperature difference information refers to the temperature difference between the actual temperature of the evaporator at the current refrigeration moment and the target temperature to be adjusted. The refrigeration working mode is used to represent the working mode of the target vehicle for battery refrigeration. In this embodiment, during the process of the target vehicle refrigerating the vehicle battery, there may also be a need to refrigerate the passenger compartment. If the opening degree of the electronic expansion valve used to control the vehicle battery refrigeration process is too large, it may lead to uneven distribution of the refrigerant flow rate, thus unable to meet the refrigeration demand of the passenger compartment. Therefore, in this embodiment, it is also necessary to consider the refrigeration working mode of the target vehicle at the current refrigeration moment to finally determine the target opening degree.

[0122] Specifically, when the controller obtains the target opening degree of the electronic expansion valve at the current refrigeration moment, it first needs to obtain the refrigeration working mode of the target vehicle at the current refrigeration moment and obtain the temperature difference information of the evaporator of the vehicle at the current refrigeration moment.

[0123] Step S502: According to the refrigeration working mode, obtain the passenger compartment comfort compensation coefficient set in advance for the passenger compartment, and use the passenger compartment comfort compensation coefficient and the temperature difference information to obtain the opening degree loss of the electronic expansion valve at the current refrigeration moment.

[0124] The opening degree loss refers to the reduction in the opening degree of the electronic expansion valve at the current refrigeration moment caused by the refrigeration demand of the passenger compartment. This loss is used to avoid the situation where the opening degree of the electronic expansion valve is too large, resulting in uneven distribution of the refrigerant flow rate and inability to meet the refrigeration demand of the passenger compartment. And this loss can be obtained according to the passenger compartment comfort compensation coefficient and the temperature difference information, where the passenger compartment comfort compensation coefficient is related to the refrigeration working mode, and for different refrigeration working modes, the passenger compartment comfort compensation coefficient may be different.

[0125] Specifically, after the controller obtains the refrigeration working mode, it can obtain the passenger compartment comfort compensation coefficient corresponding to this refrigeration working mode, which is set in advance for the passenger compartment of the target vehicle. Then, it can use the passenger compartment comfort compensation coefficient and the temperature difference information obtained in step S501 to calculate the opening degree loss of the electronic expansion valve at the current refrigeration moment.

[0126] Step S503: Obtain the target opening degree according to the basic opening degree, composite opening degree, opening degree adjustment rate, battery refrigeration duration, and opening degree loss.

[0127] Finally, the controller can calculate the target opening degree according to the basic opening degree, composite opening degree, opening degree adjustment rate, battery refrigeration duration, and opening degree loss. For example, the target opening degree can be calculated through the following formula:

[0128]

[0129] Among them, represents the target opening degree of the electronic expansion valve at the current refrigeration moment, represents the basic opening degree of the electronic expansion valve at the current refrigeration moment, represents the composite opening degree of the electronic expansion valve at the current refrigeration moment, represents the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment, represents the battery refrigeration duration, and represents the opening degree loss at the current refrigeration moment. Among them represents the occupant compartment comfort compensation coefficient in the refrigeration working mode at the current refrigeration moment, and represents the temperature difference information of the evaporator at the current refrigeration moment.

[0130] In this embodiment, the occupant compartment comfort compensation coefficient can also be obtained based on the refrigeration working mode according to the refrigeration working mode of the target vehicle at the current refrigeration moment and the temperature difference of the evaporator of the target vehicle at the current refrigeration moment, so as to calculate the opening degree loss by using the occupant compartment comfort compensation coefficient and the temperature difference, and then combine the basic opening degree, the composite opening degree, the opening degree adjustment rate, the battery refrigeration duration and the opening degree loss to obtain the target opening degree. By this method, during the refrigeration process of the vehicle battery, the situation that the refrigerant flow rate distribution is uneven and the refrigeration demand of the occupant compartment cannot be met can be avoided, and the accuracy of the target opening degree setting can be further improved.

[0131] Further, the refrigeration working mode includes: a first working mode for characterizing preferentially refrigerating the occupant compartment, a second working mode for preferentially refrigerating the battery of the target vehicle, and a third working mode for only refrigerating the battery; step S502 can further include: when the refrigeration working mode is the first working mode, setting the occupant compartment comfort compensation coefficient to the first compensation coefficient; when the refrigeration working mode is the second working mode, setting the occupant compartment comfort compensation coefficient to the second compensation coefficient; where the second compensation coefficient is less than the first compensation coefficient; when the refrigeration working mode is the third working mode, setting the occupant compartment comfort compensation coefficient to zero.

[0132] In this embodiment, the refrigeration working mode for battery refrigeration can include the following three working modes, namely, a first working mode for preferentially refrigerating the occupant compartment, a second working mode for preferentially refrigerating the battery, and a third working mode for only refrigerating the battery without refrigerating the occupant compartment. The set occupant compartment comfort compensation coefficients are also different in the three working modes. If it is the first working mode for preferentially refrigerating the occupant compartment, it is set to the first compensation coefficient, and if it is the second working mode for preferentially refrigerating the battery, it is set to the second compensation coefficient.

[0133] And according to the formula: , it can be known that the comfort compensation coefficient of the passenger compartment is negatively correlated with the target opening. In the first working mode, since it is necessary to give priority to cooling the passenger compartment, the opening of the electronic expansion valve needs to be reduced to a large extent. Therefore, a relatively large comfort compensation coefficient of the passenger compartment is adopted. In the second working mode, since it is necessary to give priority to cooling the battery, the opening of the electronic expansion valve can only be reduced to a small extent. Therefore, a relatively small comfort compensation coefficient of the passenger compartment is adopted. Therefore, the second compensation coefficient is smaller than the first compensation coefficient.

[0134] If the refrigeration working mode is the third working mode of only cooling the battery, that is, there is no need to cool the passenger compartment, the comfort compensation coefficient of the passenger compartment can be directly set to zero.

[0135] In this embodiment, the refrigeration working mode may include a first working mode of preferentially cooling the passenger compartment, a second working mode of preferentially cooling the battery of the target vehicle, and a third working mode of only cooling the battery. Thus, the corresponding comfort compensation coefficient of the passenger compartment can be set according to different working modes, and the intelligence level of setting the comfort compensation coefficient of the passenger compartment can be further improved in this way.

[0136] In addition, step S501 may further include: when there is a refrigeration demand in the passenger compartment and the battery cell temperature of the target vehicle exceeds the first temperature threshold but does not exceed the second temperature threshold, determining that the refrigeration working mode is the first working mode; the second temperature threshold is greater than the first temperature threshold; when there is a refrigeration demand in the passenger compartment and the battery cell temperature exceeds the second temperature threshold but does not exceed the third temperature threshold, determining that the refrigeration working mode is the second working mode; the third temperature threshold is greater than the second temperature threshold; when the battery cell temperature exceeds the third temperature threshold, or when there is no refrigeration demand in the passenger compartment and the battery cell temperature exceeds the first temperature threshold, determining that the refrigeration working mode is the third working mode.

[0137] Among them, the first temperature threshold is the temperature threshold for setting the battery to start the cooling process, the second temperature threshold is the temperature threshold for preferentially ensuring battery cooling, and the third temperature threshold is the battery limit threshold temperature. It can be seen that the first temperature threshold is less than the second temperature threshold, and the second temperature threshold is less than the third temperature threshold. Therefore, the controller can determine which refrigeration working mode to adopt based on the magnitude relationship between the battery cell temperature of the target vehicle at the current refrigeration moment and the above temperature thresholds.

[0138] Specifically, the controller can first determine whether the current battery cell temperature exceeds the first temperature threshold. If it exceeds, it indicates that the battery needs to be cooled currently, and thus enter the selection of the cooling working mode. After that, the controller can determine whether there is a cooling demand in the current passenger compartment. If there is no cooling demand in the current passenger compartment, the default cooling working mode is the third working mode. If there is a cooling demand in the current passenger compartment, it is determined whether the current battery cell temperature exceeds the second temperature threshold. If it does not exceed, the first working mode that preferentially cools the passenger compartment is adopted. If it exceeds the second temperature threshold, it is determined whether it exceeds the third temperature threshold. If it does not exceed, the second working mode that preferentially cools the battery of the target vehicle can be adopted. If it exceeds the third temperature threshold, that is, it has exceeded the battery limit threshold temperature, even if there is a cooling demand in the passenger compartment, the cooling for the passenger compartment needs to be stopped, that is, the third working mode that only cools the battery is set.

[0139] In this embodiment, the used cooling working mode can also be determined according to the battery cell temperature of the target vehicle and whether there is a cooling demand in the passenger compartment. By this means, the accuracy of setting the cooling working mode can be improved.

[0140] In one embodiment, an electronic expansion valve control method for single and dual cooling of the battery and passenger compartment of an electric vehicle is also provided. This method can be based on an all-round comprehensive optimization algorithm such as vehicle speed, current magnitude, ambient temperature, battery cooling time, and passenger compartment comfort. While achieving the dynamic adaptive effect of opening adjustment, it can effectively ensure battery cooling and the reasonable distribution of the refrigerant flow rate for the battery and the passenger compartment, and effectively improve the delay of the existing EXV opening PI adjustment algorithm. The specific process is as follows:

[0141] First, obtain the preset battery start cooling temperature threshold , the temperature threshold for preferentially ensuring battery cooling , the battery limit threshold temperature And < < . When the battery temperature reaches the battery start cooling temperature threshold , the cooling of the vehicle battery needs to be started. If the battery temperature continues to rise and reaches the temperature threshold for preferentially ensuring battery cooling , if the passenger compartment cooling is turned on at the same time, the working mode that preferentially ensures battery cooling needs to be switched. After that, if the battery temperature continues to rise and reaches the battery limit threshold temperature , at this time, the passenger compartment cooling needs to be turned off to ensure that all the refrigerant is used for battery cooling. During single battery cooling, when the highest temperature T of the current battery cell exceeds the threshold and is less than When setting, the basic opening degree of the EXV is , and this parameter only needs to meet the most basic cooling requirements of the battery under different ambient temperatures. Please refer to Table 4.

[0142] In Table 4, is obtained through actual calibration work, only meeting the most basic cooling requirements of the battery. Since the heat generation amount and cooling effect of the battery corresponding to different ambient temperatures are different, when a constant heat generation power is given to the battery in the environmental chamber and the battery cooling is turned on for 10 minutes, when the average temperature of the battery cells remains stable without rising or falling, record the opening degree of the current electronic expansion valve. In addition, since the size of the heat generation power of the battery directly affects the cooling effect, it is recommended to refer to the driving conditions at different constant vehicle speeds for the value of the heat generation power of the battery.

[0143] When the vehicle is traveling fast or the outside ambient temperature is high, the heat generation amount of the battery at this time is large, and the basic opening degree cannot meet the battery cooling requirements. The common method of PI control to adjust the opening degree is calculated based on the superheat degree on the battery side. Since it has just entered the cooling at this time, and a large amount of time is required for the three heat exchange paths of the battery and the cold plate, the cold plate and the refrigerant, and the refrigerant and the outside environment in the entire cooling system to transfer heat, the superheat degree usually cannot be guaranteed to be controlled within the range of the target superheat degree (taking 5°C as an example) in the initial cooling, and the opening degree needs to be adjusted for a long time before the superheat degree can be stable, resulting in a very lagging adjustment process. Therefore, here it is proposed to directly adjust the opening degree of the EXV based on the cooling time of the battery, associate the opening degree size with the cooling time, and obtain the opening degree size of the EXV The calculation formula is as follows:

[0144]

[0145] Among them, t is the time when the battery cooling starts, with the unit of s; is the composite opening degree of the electronic expansion valve, and n is the adjustment rate of the expansion valve opening degree. Similar to , also needs to be calibrated, and its size should fully meet the cooling requirements of the battery. Taking Table 5 as an example.

[0146] To better demonstrate the function of , here n = 5 is taken as an example. As shown in Figure 6 , as the cooling time of the battery increases, the value of the function becomes larger and closer to 1. Therefore, through this function, the upper limit of the EXV opening degree adjustment can be made, thus avoiding the waste of cooling capacity caused by excessive refrigerant flow or affecting the comfort of the passenger compartment. In addition, if the value of n is larger, the function The faster the rate of change. Therefore, the adjustment rate n should be directly related to the heat generation of the battery, ignoring a series of complex and lagging processes such as intermediate heat exchange, and directly achieving the purpose of quickly adjusting the opening based on the temperature change trend of the battery itself.

[0147] In the calculation of heat generation, it is usually assumed that the battery pack has a uniform internal heat generation distribution. The heat generation of the battery is divided into two parts: irreversible Joule heat and reversible reaction heat. When calculating the total heat generation of the battery, the lithium-ion battery heat generation model proposed by Bernaridi, which is widely used, is adopted. The expression for the heat generation rate q of the battery is as follows:

[0148]

[0149] Among them, is the volume of a single battery, with the unit of m 3 ; I is the current, with the unit of A; is the open-circuit voltage, with the unit of V; U is the working voltage, with the unit of V; T is the temperature, with the unit of K.

[0150] From the above formula, it can be seen that the heat generation rate q of the battery is directly related to the current I of the current charge and discharge of the battery. That is, the larger the current, the greater the heat generation rate, and ultimately the greater the heat generation. For the AC and DC charging of the battery, its current is relatively stable and there will be no large fluctuations in a short time. However, in the working conditions of the vehicle driving or using the air conditioner and other battery discharges, affected by the vehicle speed, high-voltage accessories, road conditions, and energy recovery, etc., the current will have huge fluctuations of dozens or hundreds of amperes in a short time, resulting in large fluctuations in its heat generation rate in a short time. Therefore, simply evaluating the opening of the EXV at this time based on the current size will inevitably cause a large error. Therefore, the adjustment rate n is revised again to the following formula:

[0151]

[0152] Among them, is the basic adjustment rate, is the working condition correction coefficient, is the current correction coefficient.

[0153] First, for the basic adjustment rate , when evaluating the energy efficiency of electric vehicles, since vehicle speed is one of the key factors affecting battery power consumption, the energy consumption difference is significant at different vehicle speeds and directly affects the current magnitude. Therefore, based on the vehicle speed, the vehicle driving conditions can be roughly divided into three cases: 1. Low-speed driving (V ≤ 40 km / h), usually reflected in congested sections or frequent stop-and-go situations in urban traffic. 2. Medium-speed driving (40 < V < 80 km / h), which is the common speed range of most urban expressways and some highways. 3. High-speed driving (V ≥ 80 km / h), when the vehicle enters the highway and drives at a high speed, the energy consumption will increase significantly. At this time, the basic adjustment rate The selection can be as shown in Table 3.

[0154] Considering the low-speed driving situation, the overall current magnitude is small, but the frequent acceleration and deceleration enable the regenerative braking system to effectively recover energy, and at the same time, it also causes large fluctuations in the current; during medium-speed driving, compared with low-speed driving, the regenerative braking opportunities decrease, and it is relatively stable as a whole, but there is still a certain amount of energy recovery. To sum up, due to the real-time change of vehicle conditions, in order to reflect the overall change trend, current fluctuation and vehicle speed fluctuation are introduced here, and their definitions are as follows:

[0155]

[0156]

[0157] Among them, and are the maximum and minimum values of the current within a cycle (3 s), with the unit of A; and are the maximum and minimum values of the vehicle speed within a cycle, with the unit of km / h. Then, the correction coefficient is used to correct the three driving conditions, and the look-up table is shown in Table 1.

[0158] Then, considering that when the vehicle is driving at a high speed, the motor load increases and a larger power output is required. At this time, the overall current magnitude is relatively high, and the change of the current is slow and relatively stable. Therefore, the current correction parameter is introduced, and its calculation formula is as follows:

[0159]

[0160] Among them, is the absolute value of the current, is the current calibration parameter, and the look-up table is shown in Table 2.

[0161] To avoid the influence of small current when the vehicle is stationary on the calculation of the correction parameter There has been a situation where it is too small. When the absolute value of the current is less than 50, it is defaulted that calculations are performed, and in other cases, the above formula is used to query Table 2 for calculations.

[0162] In summary, the final opening degree of the EXV during single cooling is obtained The calculation formula is:

[0163]

[0164] After introducing the cooling of the passenger compartment, it is converted from single cooling to dual cooling at this time. To ensure the cooling of both the passenger compartment and the battery simultaneously, the calculation formula for single battery cooling is finally converted to:

[0165]

[0166] Among them, is the comfort compensation for the passenger compartment. The larger it is, the less refrigerant is allocated to the battery side. According to the actual calibration situation, it is divided into three types: passenger compartment priority , battery priority and only battery cooling where , ; is the temperature difference between the actual temperature of the current evaporator and the target temperature. The execution logic of the single - dual cooling priority of the passenger compartment can be as Figure 7 shown.

[0167] In summary, the calculation logic of the opening algorithm of the EXV provided in this embodiment is as follows:

[0168] 1. The controller reads the current vehicle speed V, the absolute value of the current magnitude , the current fluctuation within one cycle (3s) and the vehicle speed fluctuation as well as the highest temperature T of the current battery cell and the external ambient temperature Ta;

[0169] 2. Determine the priority of the current single - dual cooling and calculate the basic opening degree , the composite opening degree , the basic adjustment rate , the working condition correction coefficient and the current calibration parameter as well as the comfort compensation for the passenger compartment ;

[0170] 3. Then read the time when the battery enters cooling and calculate the opening degree of the current EXV;

[0171] 4. Repeat the above steps to complete the EXV opening control under different working conditions until the battery cooling exits.

[0172] Through this embodiment, during battery cooling, adaptive dynamic adjustment can be comprehensively achieved based on aspects such as vehicle speed, current magnitude, ambient temperature, and occupant compartment comfort. Therefore, the latency of the traditional PI regulation algorithm for EXV opening based on superheat is improved, and the opening is directly adjusted according to the vehicle condition. Moreover, during battery cooling, it can also meet different occupant compartment and battery refrigeration effects and flow distribution according to the vehicle model calibration.

[0173] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0174] Based on the same inventive concept, the embodiments of the present application also provide an electronic expansion valve control device for implementing the above-mentioned electronic expansion valve control method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the following electronic expansion valve control device can refer to the limitations on the electronic expansion valve control method in the above text, and will not be repeated here.

[0175] In one embodiment, as Figure 8 shown, an electronic expansion valve control device is provided, including: a vehicle information acquisition module 801, an adjustment information acquisition module 802, and a target opening acquisition module 803, where:

[0176] The vehicle information acquisition module 801 is configured to acquire the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and acquire the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the starting refrigeration moment of the target vehicle's battery to the current refrigeration moment;

[0177] The adjustment information acquisition module 802 is configured to acquire the basic opening and composite opening of the electronic expansion valve of the target vehicle at the current refrigeration moment according to the ambient temperature and vehicle speed information, and acquire the opening adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information;

[0178] A target opening degree acquisition module 803, configured to acquire a target opening degree of an electronic expansion valve at the current refrigeration moment according to a basic opening degree, a composite opening degree, an opening degree adjustment rate, and a battery refrigeration duration; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening degree.

[0179] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a basic opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment according to vehicle speed information; acquire a first correction coefficient and a second correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment; and use the first correction coefficient and the second correction coefficient to correct the basic opening degree adjustment rate to obtain an opening degree adjustment rate.

[0180] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a refrigeration control cycle where the current refrigeration moment is located, and acquire current current fluctuation information and current vehicle speed fluctuation information of the refrigeration control cycle; the current current fluctuation information is used to characterize the fluctuation of the battery current of the target vehicle in the refrigeration control cycle, and the current vehicle speed fluctuation information is used to characterize the fluctuation of the vehicle speed of the target vehicle in the refrigeration control cycle; acquire a pre-constructed first calibration relationship; different current fluctuation information, vehicle speed fluctuation information, and corresponding relationships with different first correction coefficients are stored in the first calibration relationship; wherein, the first correction coefficient has a negative correlation with the current fluctuation information and the vehicle speed fluctuation information; and use the correction coefficient corresponding to the current current fluctuation information and the current vehicle speed fluctuation information in the first calibration relationship as the first correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment.

[0181] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a current battery current value of the target vehicle at the current refrigeration moment, and a pre-constructed second calibration relationship; different battery current values and corresponding relationships with different current calibration parameters are stored in the second calibration relationship; wherein, the current calibration parameter has a positive correlation with the battery current value; acquire the current current calibration parameter corresponding to the current battery current value from the second calibration relationship; and obtain the second correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment according to the current battery current value and the current current calibration parameter.

[0182] In one embodiment, the adjustment information acquisition module 802 is further configured to update the current battery current value to the minimum battery current value when the current battery current value does not reach the minimum battery current value stored in the second calibration relationship.

[0183] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a pre-constructed third calibration relationship; the third calibration relationship stores the corresponding relationship between different vehicle speed ranges and different basic opening adjustment rates; wherein, the basic opening adjustment rate is positively correlated with the vehicle speed range; acquire the target vehicle speed range where the vehicle speed information is located, and use the basic opening adjustment rate corresponding to the target vehicle speed range in the third calibration relationship as the basic opening adjustment rate at the current refrigeration moment.

[0184] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a pre-constructed fourth calibration relationship; the fourth calibration relationship stores the corresponding relationship between different ambient temperatures and vehicle speed information and different basic openings; use the basic opening corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fourth calibration relationship as the basic opening of the electronic expansion valve at the current refrigeration moment.

[0185] In one embodiment, the adjustment information acquisition module 802 is further configured to acquire a pre-constructed fifth calibration relationship; the fifth calibration relationship stores the corresponding relationship between different ambient temperatures and vehicle speed information and different composite openings; use the composite opening corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fifth calibration relationship as the composite opening of the electronic expansion valve at the current refrigeration moment.

[0186] In one embodiment, the target opening acquisition module 803 is further configured to acquire the refrigeration working mode of the target vehicle at the current refrigeration moment, and acquire the temperature difference information of the evaporator of the target vehicle at the current refrigeration moment; the temperature difference information represents the difference between the actual temperature and the target temperature of the evaporator at the current refrigeration moment; the evaporator is used to adjust the temperature of the passenger compartment of the target vehicle; according to the refrigeration working mode, acquire the passenger compartment comfort compensation coefficient pre-set for the passenger compartment, and use the passenger compartment comfort compensation coefficient and the temperature difference information to obtain the opening loss of the electronic expansion valve at the current refrigeration moment; obtain the target opening according to the basic opening, the composite opening, the opening adjustment rate, the battery refrigeration duration and the opening loss.

[0187] In one embodiment, the refrigeration working mode includes: a first working mode for indicating preferential refrigeration of the passenger compartment, a second working mode for preferential refrigeration of the battery of the target vehicle, and a third working mode for only refrigerating the battery; the target opening acquisition module 803 is further configured to set the passenger compartment comfort compensation coefficient as the first compensation coefficient when the refrigeration working mode is the first working mode; set the passenger compartment comfort compensation coefficient as the second compensation coefficient when the refrigeration working mode is the second working mode; wherein, the second compensation coefficient is less than the first compensation coefficient; set the passenger compartment comfort compensation coefficient to zero when the refrigeration working mode is the third working mode.

[0188] In one embodiment, the target opening degree acquisition module 803 is further configured to determine that the refrigeration working mode is the first working mode when there is a refrigeration demand in the passenger compartment and the battery cell temperature of the target vehicle exceeds the first temperature threshold but does not exceed the second temperature threshold; the second temperature threshold is greater than the first temperature threshold; when there is a refrigeration demand in the passenger compartment and the battery cell temperature exceeds the second temperature threshold but does not exceed the third temperature threshold, determine that the refrigeration working mode is the second working mode; the third temperature threshold is greater than the second temperature threshold; when the battery cell temperature exceeds the third temperature threshold, or when there is no refrigeration demand in the passenger compartment and the battery cell temperature exceeds the first temperature threshold, determine that the refrigeration working mode is the third working mode.

[0189] Each module in the above electronic expansion valve control device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in or independent of the processor in the controller in the form of hardware, or stored in the memory in the controller in the form of software, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0190] In one embodiment, a controller is provided, and its internal structure diagram can be as Figure 9 shown. The controller includes a processor, a memory, an input / output interface, and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the controller is used to exchange information between the processor and external devices. The communication interface of the controller is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it implements an electronic expansion valve control method.

[0191] Those skilled in the art can understand that Figure 9 the structure shown in

[0192] In one embodiment, a controller is further provided, which includes a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0193] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0194] In one embodiment, a computer program product is provided, which includes a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0195] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0196] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0197] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in the present application.

[0198] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An electronic expansion valve control method, characterized in that, The method includes: Obtaining the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and obtaining the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the starting refrigeration moment of the battery of the target vehicle to the current refrigeration moment; According to the ambient temperature and the vehicle speed information, obtaining the basic opening degree and the composite opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment, and according to the vehicle speed information, obtaining the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment; According to the basic opening degree, the composite opening degree, the opening degree adjustment rate and the battery refrigeration duration, obtaining the target opening degree of the electronic expansion valve at the current refrigeration moment; the target opening degree is used to control the opening degree of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening degree.

2. The method according to claim 1, wherein The obtaining the opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information includes: According to the vehicle speed information, obtaining the basic opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment; Obtaining a first correction coefficient and a second correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment; Using the first correction coefficient and the second correction coefficient to correct the basic opening degree adjustment rate to obtain the opening degree adjustment rate.

3. The method according to claim 2, characterized in that The first correction coefficient is obtained through the following steps: Obtaining the refrigeration control cycle where the current refrigeration moment is located, and obtaining the current current fluctuation information and the current vehicle speed fluctuation information of the refrigeration control cycle; the current current fluctuation information is used to characterize the fluctuation situation of the battery current of the target vehicle in the refrigeration control cycle, and the current vehicle speed fluctuation information is used to characterize the fluctuation situation of the vehicle speed of the target vehicle in the refrigeration control cycle; Obtaining a pre-constructed first calibration relationship; In the first calibration relationship, there is a corresponding relationship between different current fluctuation information and vehicle speed fluctuation information and different first correction coefficients; among them, the first correction coefficient has a negative correlation with the current fluctuation information and the vehicle speed fluctuation information; Taking the correction coefficient corresponding to the current current fluctuation information and the current vehicle speed fluctuation information in the first calibration relationship as the first correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment.

4. The method according to claim 2, wherein The second correction coefficient is obtained through the following steps: Obtaining the current battery current value of the target vehicle at the current refrigeration moment, and a pre-constructed second calibration relationship; in the second calibration relationship, there is a corresponding relationship between different battery current values and different current calibration parameters; among them, the current calibration parameter has a positive correlation with the battery current value; Obtaining the current current calibration parameter corresponding to the current battery current value from the second calibration relationship; According to the current battery current value and the current current calibration parameter, obtaining the second correction coefficient for correcting the basic opening degree adjustment rate in the current refrigeration moment.

5. The method according to claim 2, characterized in that, Obtaining the basic opening degree adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information includes: Obtaining a pre-constructed third calibration relationship; the third calibration relationship stores the corresponding relationship between different vehicle speed intervals and different basic opening degree adjustment rates; wherein, the basic opening degree adjustment rate is positively correlated with the vehicle speed interval; Obtaining the target vehicle speed interval where the vehicle speed information is located, and using the basic opening degree adjustment rate corresponding to the target vehicle speed interval in the third calibration relationship as the basic opening degree adjustment rate at the current refrigeration moment.

6. The method according to claim 1, wherein Obtaining the basic opening degree of the electronic expansion valve of the target vehicle at the current refrigeration moment according to the ambient temperature and the vehicle speed information includes: Obtaining a pre-constructed fourth calibration relationship; the fourth calibration relationship stores the corresponding relationship between different ambient temperatures and vehicle speed information and different basic opening degrees; Using the basic opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fourth calibration relationship as the basic opening degree of the electronic expansion valve at the current refrigeration moment.

7. The method according to claim 1, characterized in that The composite opening degree is obtained through the following steps: Obtaining a pre-constructed fifth calibration relationship; the fifth calibration relationship stores the corresponding relationship between different ambient temperatures and vehicle speed information and different composite opening degrees; Using the composite opening degree corresponding to the ambient temperature and vehicle speed information at the current refrigeration moment in the fifth calibration relationship as the composite opening degree of the electronic expansion valve at the current refrigeration moment.

8. The method according to any one of claims 1 to 7, characterized in that Obtaining the target opening degree of the electronic expansion valve at the current refrigeration moment according to the basic opening degree, composite opening degree, opening degree adjustment rate, and the battery refrigeration duration includes: Obtaining the refrigeration working mode of the target vehicle at the current refrigeration moment, and obtaining the temperature difference information of the evaporator of the target vehicle at the current refrigeration moment; the temperature difference information represents the difference between the actual temperature and the target temperature of the evaporator at the current refrigeration moment; the evaporator is used to adjust the temperature of the passenger compartment of the target vehicle; According to the refrigeration working mode, obtaining the passenger compartment comfort compensation coefficient pre-set for the passenger compartment, and using the passenger compartment comfort compensation coefficient and the temperature difference information to obtain the opening degree loss of the electronic expansion valve at the current refrigeration moment; Obtaining the target opening degree according to the basic opening degree, composite opening degree, opening degree adjustment rate, the battery refrigeration duration, and the opening degree loss.

9. The method according to claim 8, wherein The refrigeration working mode includes: a first working mode for indicating preferential refrigeration of the passenger compartment, a second working mode for preferential refrigeration of the battery of the target vehicle, and a third working mode for only refrigerating the battery; obtaining the passenger compartment comfort compensation coefficient pre-set for the passenger compartment according to the refrigeration working mode includes: In the case where the refrigeration working mode is the first working mode, setting the passenger compartment comfort compensation coefficient as the first compensation coefficient; When the refrigeration working mode is the second working mode, set the comfort compensation coefficient of the passenger compartment to the second compensation coefficient; wherein, the second compensation coefficient is less than the first compensation coefficient. When the refrigeration working mode is the third working mode, set the comfort compensation coefficient of the passenger compartment to zero.

10. The method according to claim 9, characterized in that The obtaining of the refrigeration working mode of the target vehicle at the current refrigeration moment includes: When there is a refrigeration demand in the passenger compartment and the battery cell temperature of the target vehicle exceeds the first temperature threshold but does not exceed the second temperature threshold, determine that the refrigeration working mode is the first working mode; the second temperature threshold is greater than the first temperature threshold. When there is a refrigeration demand in the passenger compartment and the battery cell temperature exceeds the second temperature threshold but does not exceed the third temperature threshold, determine that the refrigeration working mode is the second working mode; the third temperature threshold is greater than the second temperature threshold. When the battery cell temperature exceeds the third temperature threshold, or when there is no refrigeration demand in the passenger compartment and the battery cell temperature exceeds the first temperature threshold, determine that the refrigeration working mode is the third working mode.

11. An electronic expansion valve control device, characterized in that, The device includes: A vehicle information acquisition module, configured to acquire the ambient temperature and vehicle speed information of the target vehicle at the current refrigeration moment, and acquire the battery refrigeration duration of the target vehicle; the battery refrigeration duration is the duration from the start refrigeration moment of the target vehicle's battery to the current refrigeration moment. An adjustment information acquisition module, configured to acquire the basic opening and composite opening of the electronic expansion valve of the target vehicle at the current refrigeration moment according to the ambient temperature and the vehicle speed information, and acquire the opening adjustment rate of the electronic expansion valve at the current refrigeration moment according to the vehicle speed information. A target opening acquisition module, configured to acquire the target opening of the electronic expansion valve at the current refrigeration moment according to the basic opening, composite opening, opening adjustment rate and the battery refrigeration duration; the target opening is used to control the opening of the electronic expansion valve at the current refrigeration moment to be adjusted to the target opening.

12. A controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 10.

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